My calla lilies don’t bloom

Question

They have white on their leaves. They were given to me by a neighbor. I store them under my house, just like she does and bring them out in spring.

Answer 1

This could be powdery mildew from being stored in a damp location.

Treat the plant with Neem Oil.

They also may need more Phosphorous to encourage flowering. Bone Meal is a good way to do so.

Here are some links that will help.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm
https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm